.sider{
    height: 100%;
    color: #000;
    
    .title{
        height: 10%;
        display: flex;
        align-items: center;
        padding: 0 20px;
        background-color: #fff;
    }
    .list_item{
        height: 90%;
        color: #000;
        background-color: #fff;
        overflow-y: auto;

    }
}